When ESPN went on the air in September 1979, there was no running water for the couple of dozen employees at the Bristol headquarters, and they used port-a-johns and worked long hours fueled only by vendor carts at the construction site. That first 20,000-square-foot building still stands, but it has been expanded several times. The structure is now just one of 18 on a campus that has grown to 123 acres and nearly a million square feet.